Motor-control system.



4W. NAUMANN.

MOTOR CONTROL SYSTEM.

APTLIGATION FILED MAILS, 1G08.

Patenteduly 6,1909.

3 SHBEmS-SHEET 1.

Add/ff IM/NTR \/\fi L, H sa: l.. M, N. La r11 A N N ATTY; T

W. NAUMANN.

MOTOR CONTROL SYSTEM.

APPLICATION FILED MAR. a, 190e.

Patented July 6, 1909.

3 SHEETS-SHEET 2.

W. NAUMANN.

MOTOR CONTROL SYSTEM.

AEPLIGATION FILED MAILa, 190e.

927,426, Patented July 6, 1909.

3 SHEETS-SHEET [1.`y

Alternate x "y movements .Z +`y I acy I l \\N A lternat v movements INVENTUR 4 WiTNEu-JEF:

I moc] WiLHELM NAUMANN naces. ln this connection .iny invention has hoist; lTig. 3 is a diagram o for its object the'proper control o'l the inotor teni adapted for use with by which the hopper, into which the charge i"igs. el and 5 are diagi'aiiis is first dumped, is rotated. lei'red te iii connection with its is well known, iii Athe oyjieration oi' blast .lteleirine` to Fig. l the 4o furnaces the material 'with which the yfurnace blast furnace shown iii is charged is usually conveyed to the top ol l cross-section at the i'i t. the furnace by either one or two conveyors with blast furnace const or hoists, these being arranged to dump into l at l() the walls ol the the hopper at the top of the furnace. iii orl large aiidsiiiall bells.

i5 der that the loads oi material brought up by g at ll hung troni a liolloiv the hoists may be evenly distributed around which passes a rod i3 op( the hoppeigthe latteris arranged l'oirotation7 l which is supported the ugo being often driven by an electric motor. At The ri'itating hopper is sl the bottom o'l' this hopper is the upper or lit upon balls l5 which rest in.

o tle bell which can be lowered to allow the fraaie lo in any suitable charge to i'all onto the large bell in a inanmanner. Above the hop;

tain limits) it may be supplied.

wllllLHELM NAMANN, OF BERLIMIGERMANY, A

SSIGNOR TO GENERA A CORPORATION OF NEW YORK.

MOTOR-CONTROL SYSTEM.

Specification of Letters Patent. Application filed March 3, 1908.

To all whom it fr/ici/ concern: I

Be it known that l, WILHELM NAUMANN, drives the hopper has subject oi' the King ot' Prussia, residing at example, n the charge erliii, Germany, have invented certain new eeptacle arranged to receive material in instalments, to so move the receptacle and the points of delivery o'l" the material with referternately empty a load into ence to one another that the material will be der this condition it may be evenly distiibuted in said receptacle. tate the hopper not inte lt is an object of my invention to provide the saine angle but instead a system of control tor a motor used for this purpose suoli that the movement el the reeeptacle and the point of delivery oi' the inateiial with referencoto onev another may be easily, and to a large extent, automatically controlled, even though the total amount ol' material is delivered to the receptacle in inn staliiients, the number oi' which is varied from' time to time. .ln other Words, it is an object oi' my invention to so control a motor under these conditions as to insure the even distribution of material in the receptacle no inatteriin lioW inany instalments (within cer- Although l realize that my invention may ot be used ior other purposes, it is particularly adapted for, and l have described it as used in connection with the charging oi' blast l'iii- I ner well understood. Since the number ol' hoist loads which nialie up a charge may be l varied 'from time to time, the angle between theloads in the hopper is diilereiit at di llerent l times and the control loads th increased when, hoists are used, these beinh stood from t connection with the which set 'forth my blast tui-nace.

In the drawings Figure 1 is an and partly diagiaiiiniatic, ast furnace having cto; lilig. 2 is a diaysteni shown in. Fig. l

partly in section niy invention applied thei I grain ot the control arranged l'or use supported a inreiviinr upon which the rar o t the l cated at 2l), and a ear 2] is As has been stated, there Serial No. 418,971.

ese load and useful Improvements in Motor-Control hopper at angles ol' 60@ fi Systems, of which the following is a speeiii- While il' the charge compri V cation. angle between the loads Wi My invention i'elates to motor control svsl ing the charge is equally d tems, and particularly to the control oi'an the hopper. The diiiicult electric motor used, in connection with a retributing' the loads in the angles.

By my invention l provid ing and automatically sto and thereby causing` it to rotat intcrmitte matic .sto

My invention in connect as is often tunnel 17.

L ELECTRIC COMPANY,

Patented July 6, 1909.

of the inotor which been diiiicult. consists oi' six hoist s will be distributed in the For 'ein one another, ses ten loads the ll be 36 providn n l i istrihutedctijfylind y of equally dis hopper is 'further the case, two 0 arranged to althehopper. lUnnecessary to rormittently through through cltl'eieiit e means tor startpping theniotor e the hopper ntly, and lor regulating the ai1topping of the motor numbers oi' loads in a charge. will be more he iollowing descrip "fully under tion talien in accompanying' drawings invention as applied to a elevation,

ion with a single lf iiiy control systivo hoists; and lierfrinaltei -recertain toriiiulzi. upper part oi a iiiple .torni and in Those familiar notion will rectal-nine chamber between l`liesiiiallbel lis shown rod l2, through he lower end of bell (not shown).

iown at 14 inountcd a ball race on the and Well-known ier lil is rigidly The track ioist runs is indishoWii iii outline. are etten two of CIK ' connected to these hoists so arrangedthat as the car of one ascends the car of the other descends. Since the `particular construction of these hoists forms no part oi my invention, l have deemed it unnecessary to further illustrate them. rl`he motor which rotates the hopper 14 is shown at 25, being geared to the hopper through reduction gearing 26, a countershaft 27, beveled gears 2S and 29, pinion 30 and circular raclr 31 secured to the hopper. This gearing may be of any suitable kind,

lthat shown being merely illustrative of one form.

The system of control for the motor 25 illustrated in Fig. 1 is intended for use when there is but one hoist, or wlieie there are a plurality of hoists whose tracks unite at the top of the furnace in a single track. This system of control is clearly shown diagrammatically in Fig. 2. Referring particularly to Fig. 2, the armature of the motor 25 is indicated at A, and the field at F, the motor preferably being a series motor although a shunt or compound wound motor may be used if desired. The source of current supply is indicated by the conductors L and L1 and the electromagnetic switch 40 seryes to connect the motor 25 to the source in series with a resistance 41 which is interposed in the circuit in order to cut down the current on starting. Geared 'to revolve with the motoi and the hopper is a limit switch comprising a drum 42 upon which 43 which'4 are engaged byiixed ingers 44. The drum 42 is driven from the motor 25, throughv reduction gearing and a magnetic clutch 45, Whichis energized in a manner hereinafter described, and the drum is biased to a certain position by means of a spring 46, or in any other suitable manner. The fingers 44 which engagev the segments 43 are tacts c, b, c, (l, af, g, h, t' and k, which may be cir'cularly arranged and engaged by a pivoted arm K. The segments 43 are electrically connected together, and the finger which contacts with the longest one (at thel left end of the drum) is connected to one end of the actuating coil of the electromagnetic switch 40, the other end of this coil being connected to the line L1. The arm K is connected through the actuating coil of a r'elay 47, a push-button P and the coil of the electromagnetically operated clutch 45 to the line L. The relay 47 when operated closes a circuit through a resistance 48 in shunt to the push-button P. The* segments 48 'are made of a length proportional to the angle through which the hopper must be rotated between loads for diilerent numbers of' loads in a charge. As shown, the segment at the extreme right hand is of a length sullieient to maintain contact with its co-acting finger 44, While the hopper is moved 1/6 of a complete revolution; that is, this segment correare segments a setting switch having con-- sponds to siX loads or instalments of material per revolution of the hopper. Similarly, the segments whose iingers are connected respectively to the contacts b, c, d, e, f, g, 7L, i and 7c correspond respectively to 8, 10, 12, 14, 16, 18, 20, 22and A24 loads per revolution of the hopper. The length of these segments may be easily calculated and additional segments may be added for other numbers oi loads per revolution of the hopper if desired, although in actual practice the number which l have illustrated will probably be sufficient.

The operation of the system shown in Figs. 1 and 2 is obvious. The arm K is placed on that contact a or b or c, etc., which corresponds to the number of loads per revolution of the hopper which are to be used in the charge which it is desired to feed to the furnace.- After the first hoist load of material has been dumped into the hopper the pushbutton P, which maybe either manually operated or controlled automatically by some part of the hoist, is pressed and a circuit is closed from the line L, through the actuating coil of the electromagnetic clutch 45, pushbutton P, actuating coil of the relay 47, arm K, one of the contacts a to 7c, the'finger 44 connected thereto, the corresponding segment 43 to the segment whose co-acting finger is connected to the actuating coil of the electromagnetic switch 40, thence through this coil to the line L. The switch 4() is at once closed thereby connecting the motor 2.5 to the line, and at the same time the clutch 45 is closed and the reiay he `relay 47 completes a circuit through the resistance 48 in shunt to the push-button P thereby holding closed the circuit just traced independently of the push-button P. The operation of the motor 25 revolves the hopper 14 and the drum 42, which operation continues until the finger 44, which is connected to the contact upon which the arin K rests, ceases to engage with its segment. When this occurs the circuit through the operating coil of the clutch 45, the coil of the relay 47 and the coil of the switch 40 is interrupted. The switch 40, therefore opens, stopping the motor, the clutch 45 releases, allowing the spring 46to return the drum position, and the relay 47 drops, opening the shunt circuit through the resistance A48 around'the push-button P. The hopper 14 has now moved through the proper angle and a second load may be dumped into it. The push-button P may then be closed and the operation repeated. 1n this way the hopper 14 is revolved step-by-step through an angle su'l'lieient to cause an equal distribution in the hopper of the loads which make up the charge.

Before proceeding to describe the system of control illustrated in Fig. 3, adapted for use wlfiere` a blast furnace is provided Lith 47 is operated.

42 to its initial two hoats for conveying material to the hopper of the furnace, a. brief discussion of the problem involved is in order. The end to be accomplished is this: The Whole charge, 5 which is to besupplied in instalments at two points alternately on the circumference of the hopper, must be evenly distributed around said hopper; that is, the material must be so dumped into the hopper that vthe anles between the loads are the same. In o er to accomplish this result the hopper must be moved intermittently. Referring' to Fig. 4, assuming o to be the axis about which the hopper rotates, said hopper being indicated by the circle, if :t be the angle between loads when a certain number of loads of material are to be dumped at uniform angles in the hopper and il y be the angle between the lines which connect the exis o with the two points M and N at the edge of the hopper where the loads are dumped, then the angles through which the hopper should be intermittently moved are alternately .fr-g and x +31. As longr as x is greater than i/ the rotation of the hopper will always -be in the seme direction and the loads will be distrib' uted in the hopper at an angle from one another equal to x et the points M, N3, M, N4, M5, N, l\.7 and N, the letter indicating that 30` the material comes from the hoist M or N,

and the exponent indicating the order in which the loads are dumped into the hopper. f, however, 'g/ is greater than .r the value x y becomes negative, and in order to dump the loads into the hopper in the `order just nientioned it would be necessary to rotate the hopper first in one direction then in theothcr. Such a mode ot' operation would present certain difficulties which may be avoided by rotating the hopper intermittently by an'iounts which are estimated byv a dilierent formula which is suitable for use when the number of oads per revolution of the hopper is a niultiple of i?, and from where x23/ to where =y; that is, where @/2300 the followingl formulae are applicable up to 36 loads per revolution of the hopper. Referring; to Fig. 5 in which fr, as before, indicates the angle between loads in the hopper, and Iy thc'eug'lc between the dumpingr points at the circumference of the hopper, if the hopper is rotated intermittently alternately by the angles 3x y and y -x the loads will be dumped into the hopper at the angle :c from one inother,

at the points M, N2, M3, N, in the example givenv up to lNm.

the letter indicates the hoist from which the load cornes, and the exponent the order in which the loads are dumped into the hopper. From Fig. 5 it is obvious that although the adjacent loads are .not dumped into the hopper one after another, yet the result is to evenly distribute the' loads around the hop per.

` will now describe the system of control ,shownv in Fig. 3. v ln the system here illuswhich the 'lingers 44;

trated it has been assumed that the anglo be tween the lines which connect the pointe oi dumping of the two hoists' and the exis ci" the hop er7 in other words, the angle y, referred to a Dove, is equal to 30 and the system has been worked out for the same numbers oi hoist loods per revolution of the hopper asin the system illustrated in liig. 2, that is, for o, 5l, 10, l2, i4, i6, i8, 20, 22 and 2li loods. is in lig. 2, the armature oi' the motor 25 is indicated at A, and its -field at il' and a ance 41 is shown connected in scrieswith the motor in order to cut down the current in starting. ,Ils io the ,previously described l system, an elec-tromagnetic switch 1li) serves to connect the .Y rpotor to the source ol. current li and lil..

A drum ,42' which is biased to a certain position by oppositely actingT springs 4d is geared to rotate with the motor 25 and, therefore., with the hopper i4, said druni being rotated` in one direction or the other depending upon which of two magnetic clutches and are. operated. As shown, these clutches are arranged to ino've beveled gears 5() and 51, splined upon a shaft 52 geared to 'the motor, into engagement with a beveled gear 53 secured to the shaft oi the drum if/2. .This construction is, however, merely illustrative and specifically Forms no part of my invention since many other constructions could obviously be arranged to serve equally Well. rl`l1e drum 42 carries a number ol"seg ments 43 electrically connected together and having fingers 44 engagingf with. them. .Each of these lingers 44', vexcept the one at the extreme left of the druin, is'connected to a' contact a', c', ci", 62j", g', li', i or /t over which on arm K is adapted to move in a manner similar to the arrangement shown in liig. T he finger 44 at the extreme lett olii the drum 4.2 engages with the longest seg* nient and is connected to one end l the actouting coil ol the switch i() and serves to maintain at all times e connection between this coil and thesegnicnis on the drum lf2 as in the syslenii ol' rio'. 'lhe lengths ol the segments 42 on each side ol' lhc line upon rest when the drinn is restored 'to its nornuil position by means oi the springs Zlo', may be calculaliul with the aid ol' the toi-multe obere mentioned. 'lhc actuating coils ol the magnetic clutches 4:5 and 455 are connected in parallel between the line li and tl i :irre l, through the pushbut tons P1 and P2, the commotion trom the clutch i50- to the pusli-l litton lf" beineY through o. continuous eoiuiuctor, while the coin'iection from the clutch. 45b to the pushbutton P2 is thriiugh rails l or m, a bridgingi contact o, carried. by but insulated from the arm K,"f1.nd e. rail p. The purpose. of the rails l, m and p and the ci'ii'ipcratinu contact c is to cut the push-indien l out olI operation when the contact mini l. is sei. for 'l2 loads per revolution, under which condition may,

iso'

in the formula as above mentioned, and the hopper must alternately be allowed to remain at rest and be rotated 600. Under this condition it is desirable that one of' the pushbuttons be rendered inoperative. As in the system shown in l'fig. 2, relays i7a and 47h are arranged to complete circuits through resistances 48 and 4S in shunt to the pushbuttons P1 and P2.

The operation of the system shown in llig. 3 is very similar to that of the system illustrated in '.ll ig. 2. The arm K is set at the proper point and the push-buttons P and P2 are alternately operated either by hand or automatically by the hoists. The drum 42 is rotated First in one direction and then in the other'and regulates the angles through which thc hopper is intermittently rotated.

Although l have described my invention as applied to the control of electric motors, do not intend to limit it in its application to this use, but in the following claims use the term motor in the broad sense to include all l'orm of motion producing mechanisms, such as steam engines, gas engines, etc. is also .my intention to cover by my claims all embodiments of my invention which are within their scope.

What l claim as new and desire to secure by Letters Patent of the United States, is

'1. ln combination a rotating hopper, means for delivering material in instalments to said hopper, a motor/lor rotating said hopper intermittently to el'lect even distribution of the material therein, and a control system for said motor comprising a starting switch, a limit switch having a p urality of contacts for limiting the rotation of said hopper ditl erently for different numbers of loads per revolution, a drivingv connection between said limit switch andthe hopper mechanism, and

a setting switch cooperatingl with the contacts of said limit switch to regulate the I limiting etlect of the latter.

2. In combination a rotating hopper, means tor delivering material in instalments to said hopper, a motor tor rotating said hopper intermittently to eil'ect even distribution of' the material therein, and a control system tor said motor comprising a starting switch, a limit switch biased to a certain position and having a plurality ot contacts for limiting the rotation ot said hopper di'tl'erently for diilerent numbers of loads per revolution, a driving connection between said limit switch and the hop er mechanism including a magnetic clutch cosed only while said motor is energized, and a setting switch cooperating with the contacts ot said liinit switch to regulate the limiting c'llect of the latter.

3. ln combination, a rotary hopper, means for delivering material in instalments to said hopper, anmotor lor rotating said hopper, a line switch for said motor, and means ior closing and opening a control circuit to ferent lengths carried said line switch com to rotate with said o iper, segments of dity said drum, stationary 'lingers cooperating with said segments, a switch for connecting any finger and its segment in said control circuit, and a starting switch for closing said control circuit.

4. ln combination a rotary hopper, means for delivering material in instalments to said hopper, a motor for rotating said hopper intermittently to effect even distribution of the material therein, an electrically controlled line switch fo said motor, and means for controlling the closing and opening of said line switch comprising a limit switch having a plurality ot contacts closed during different angular movements ot' said limit switch, a driving connection between said limit switch and the hopper mechanism, and a setting switch cooperating with the contacts of said limit switch for arranging any one of said contacts in the control circuit of the line rising a drum arranged switch, anda starting switch for closing the control circuit. 5. In combination with a rotating hopper,

means for delivering material in instalments from two points alternately to said hopper, a motoii for rotating said hopper intermittently to etl'ect even distribution of the material therein, and a control system for said motor comprising` two starting switches, a limit switch having a plurality ofrcontacts closed during diterent angular movements of said limit switch, a driving connection between said limit switch and the hopper mechanism, and a setting switch cooperating with the contacts of said limit switch and with the starting switches to regulate the limiting etlect of the limit switch according to the number ot instalments of material delivered to said hopper per revolution.

6. ln combination, a rotary hopper, means for delivering material in instalments from two points alternately to said hop ier, a inotor tor rotating said hopper, an e ectrically controlled line switch for said motor, and means for closing and opening a control circuit to said line switch comprising a drum, segments of ditl'erent lengths carried lays-aid drum, stationary `lingers cooperating with said segments, a switch for connecting any tinger and its segment in said control circuit, a reversing driving connection between said drum and the hopper mechanism comprising two clutches, and means for closinY said control circuit aiid either one ot said dlutches.

7. In combination a rotary hopper, means for delivering material in instalments from two points alternately to'said hopper, a motor for rotating said hop er intermittently, an electrically controlled motor, and means tor controlling the control circuit to said line switch comprising a limit switch biased to a certain position and having aA plurality of contact-s closed during different ine switch for said angles of rotation of said switch, a driving conneetonbetween said limit vswitch and I the hopper mechanism including magnetic clutches Which when one o1' the other is closed cause rotation of the limit switch in opposite direet1ons,.a setting switch for ooncontacts on the 4limit switch in the control circuit, and two starting switches one of which closes the control oiru I [n Witness Wheieof, I have hereunto set my hand this eighth day of February, 1908.

WILHELM NAUMANN. ,Vitnesses:

JULIUS R-'UMLAND, KARL KRICKEBEN, 

